The Cascade Separator® Hydrodynamic Stormwater Treatment

The Cascade Separator® is the latest innovation in hydrodynamic separation from Contech. The Cascade uses advanced sediment capture technology to provide the highest sediment removal efficiency of any Contech HDS product.

The Cascade Separator is the newest innovation in stormwater treatment from Contech. The Cascade Separator was developed by Contech’s stormwater experts using advanced modeling tools and Contech’s industry leading stormwater laboratory.

This innovative hydrodynamic separator excels at sediment capture and retention while also removing hydrocarbons, trash, and debris from stormwater runoff. What makes the Cascade Separator unique is the use of opposing vortices that enhance particle settling and a unique skirt design that allows for sediment transport into the sump while reducing turbulence and resuspension of previously captured material. These two factors allow the Cascade Separator to treat high flow rates in a small footprint, resulting in an efficient and economical solution for any site.

• Stormwater enters the Cascade Separator through one or multiple inlets and/or a grate inlet.
• As water enters the unit, it impacts the center cylinder and is directed to two separate flumes.
• Water traveling through the opposing flumes enters the center chamber where vortices rotate in opposite directions and facilitate enhanced particle settling.
• As water swirls downward sediment settles into the sump and treated water exits through the outlet window and exits the system.
• When flows exceed the capacity of the flumes, the excess water flows over the flumes and exits the system without re-suspending or washing out previously captured pollutants.
• The system incorporates a partially perforated slanted skirt that equalizes the pressure between the storage and treatment zone while reducing the potential for scour. The skirt also allows transport of sediment and debris into the sump zone which improves ease of maintenance since all captured material can be removed through the center cylinder.

FEATURES

Unique skirt design & opposing vortices

Inlet area accepts wide range of inlet pipe angles

Accepts multiple inlet pipes

Grate inlet option

Internal bypass

Clear access to sump and stored pollutants

BENEFITS

Superior TSS removal; reduced system size and costs

Design and installation flexibility

Eliminates the need for separate junction structure

Eliminates the need for a separate grate inlet structure

Eliminates the need for a separate bypass structure

Fast, easy maintenance

• New Jersey Department of Environmental Protection (NJDEP)

• Inline, offline, grate inlet, and drop inlet configurations available

• Cascade provides unobstructed access to stored pollutants, making it easy to maintain using a vacuum truck, with no requirement to enter the unit.
• Contech has a network of Certified Maintenance Providers to provide maintenance on Cascade and other stormwater BMP’s.

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